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| The present invention relates to the field of acousto-optical scanners, especially those capable of generating fast non-linear scans, and/or fast longitudinal focus scanning. This new scheme, which provides a new acousto-optic scanner capable of high scanning speed, by the use of two acoustic waves with the same frequency modulation, propagating in opposite directions through one or more acousto-optical media. This scheme completely suppresses the linear frequency chirp, and thus enables the generation of fast non-linear scans and non-constant linear scans, with a much smaller reduction of the NRP as compared to the linear scan case. In addition, by changing the phase between the modulating signals, such a scanning system also provides fast longitudinal scans of the focal point of the beam along the optical axis. The method can be readily generalized to two-dimensional scans by cascading two of such one-dimensional scanners orthogonally. The applications of this technology include high-end microscopy and optical inspection.present relates field acousto-optical scanners capable fast non-linear scans and/or longitudinal focus scanning |
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